IDNLearn.com: Your reliable source for finding precise answers. Our experts provide timely, comprehensive responses to ensure you have the information you need.

the set of hexadecimal digits consisting of from one through four digits can be thought of as broken up into disjoint subsets: s1, s2, and so forth, where each sk consists of the strings with k hexadecimal digits. there are $ incorrect: your answer is incorrect. strings in s1, $ incorrect: your answer is incorrect. strings in s2, and so forth. thus, by the addition correct: your answer is correct. rule, the total number of strings is .'